When you start your computer up, it will say (press something to enter setup). Usually it's F1 or F2 or DEL. Once you're in your BIOS, it will indicate everything that's connected to the different interfaces on your motherboard; IDE0 or IDE1 with a bunch of numbers next to them but you will probably see 3 things: Your HDD, your CD drive and your DVD drive if you have it connected right. If you only see 2 devices connected to all of your IDE interfaces, then you have a problem with your jumpers or your cable. I would put all your jumpers to cable select (CS) if you don't see the devices and make SURE everything is plugged in right...the cable, the power, the jumper.